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Series B Mandatorily Redeemable Preferred Stock (Details) - USD ($)
 1 Months Ended 6 Months Ended 12 Months Ended
Aug. 31, 2014
Jun. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]        
Preferred stock extend redemption date   Aug. 01, 2019    
Preferred stock redemption extension fee paid   $ 153,500    
Interest expense     $ 12,954,079 $ 13,531,337
Total unamortized deferred stock costs     $ 1,683,000 $ 1,942,000
Redeemable Convertible Preferred Stock Series B [Member]        
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]        
Proceeds from private placement offering $ 40,000,000      
Preferred stock shares issued (in shares)     30,700 32,700
Preferred stock, par or stated value (in dollars per share)     $ 0.01 $ 0.01
Liquidation preference per share (in dollars per share)     $ 1,000 $ 1,000
Financial Instruments Subject to Mandatory Redemption, Return On Funds Invested     14.00%  
Deferred financing costs     $ 3,100,000  
Interest expense     630,000 $ 1,014,000
Total unamortized deferred stock costs     $ 115,000 $ 592,000
Number of shares redeemed     2,000 2,300
Number of shares redeemed, value     $ 2,000,000 $ 2,300,000
Preferred stock shares outstanding (in shares)     30,700 32,700